关键词: 填缝材料;苯丙乳液;正交试验;定伸粘结性;峰值应变;断裂伸长率

Abstract: Styrene-acrylic latex , cement , packing and accessory ingredient were employed to prepare Polymer cement pavement joint sealant ( PCJS) .The influence rules of the three factors:liquid to powder ratio, cement ratio and packing type to cohesiveness at maintained extension , peak strain and elongation at break were investigated through the method of orthogonal experiment .It is indicated that with the increase of liquid to powder ratio and cement ratio , the cohesiveness at maintained extension of PCJS is gradually enhanced .Talcum powder and heavy calcium carbonate both can improve its cohesiveness at maintained extension Liquid to powder ratio is the main factor influencing the peak strain and the elongation at break of PCJS .With the increase of liquid to powder ratio , peak strain and elongation at break are increased .With the increase of cement ratio , peak strain first decreased and then increased , elongation at break has an increased tendency .The peak strain and the elongation at break of PCJS are larger when the packing is heavy calcium .For the peak strain index , the liquid to powder ratio affect it most , then and the cement ratio the packing type .For the elongation at break index , the liquid to powder ratio affect it most , then the packing type and the cement ratio .The deformation property of PCJS is optimum when the liquid to powder ratio is 1:0 .45 , the cement ratio is 60% and the packing is heavy calcium.

Key words: joint sealant;styrene-acrylic latex;orthogonal experiment;cohesiveness at maintained